818 



INDEX 



Phoronis, 357 : Maqdlania, 362 : As- 

 teriax, 382 : Sea-urchin, 399, 400 : Sea- 

 cucumber, 403, 404: Antedou, 407: 

 Echinodermata, 428 : Nereis, 442 : 

 Lumbricus, 457 : Chaetopoda, 475 : 

 Sipunculus, 493, 494 : Gephyrea, 498 : 

 Hirudo, 409, 410: Hirudi'nea, 518: 

 Apus, 532, 533: Astacux, 548: Crus- 

 tacea, 593 : Peripatus, 608 : Myria- 

 poda, 617: Periplaneta, 624, 625 ; In- 

 secta, 640, 641 : Scorpion, 656, 657, 

 658 : Arachnida, 667 : Anodonta, 684, 

 685 : Pelecypoda, 704 : Amphineura, 

 715 : Triton, 726, 727, 728 : Gastro- 

 poda, 744 : Scaphopoda, 757 ; Sepia, 

 763 : Natttiluv, 786 ; Cephalopoda, 797 



Dimorpha, 70, 71 



Dimorphism, in Foraminifera, 56 : in 

 Radiolaria, 63: in Flagellata, 76: in 

 Ciliata, 97, 98 



Dimorphism, sexual, 40* 



Dimorphograptus, 167 



Dimyaria, 290 



Dinobryon, 71, 74 



Dinoflagellata, 69* : Characteristic fea- 

 tures, 78, 79 



Dinophilea, 336, 337 



Dinophilus, 524, 337 



Direeious, 40*, 139* 



Diophrys, S2, 94 



Diphyes, 164, 165 



Dipleurula, 432* 



Diplomita, 71 



Diplopoda, 615*, 617, 618 



Diplozoon, 277 



Diptera, 634*, 638, 639, 640, 644, 646, 

 647, 649, 651 , 653 



Directive mesenteries, of Sea-anemone, 

 189 



Dixcina, 189, 366, 368 



Disc, 185* 



Disc-jellies, 182 



Discoidal segmentation, 659 



Discomedusse, 176*, 182, 183, 189 



Dixcorbina, 53 



Discosoma, 208, 210 



Discrtelium lanceolatum, 285 



Dissepiments, 205* 



Distinctive characters See Classification 



DistomidcB, 253*, 254 



Dwtomum, 265 



DISTOMUM HEPATICUM, 240 See 

 Fasciola hepatica 



Distomum rathousii, 285 



Distribution, 8: of Sponges, 126: Hydro- 

 corollinae, 159 : Scyphozoa, 184 : Ac- 

 tinozoa, 209 : Ctenophora, 224 : Platy- 

 helminthes, 283 : Ectoprocta, 353 : 

 Brachiopoda, 371 : Gephyrea, 502 ; 

 Hirudinea, 524: Onychop'hora, 612: 

 Pelecypoda, 710 : Amphineura, 720 : 

 Gastropoda, 755 : Cephalopoda, 803 



Distribution, geographical, 8. 



Distribution, geological, 8* : of Forami- 

 nifera, 56 : Sponges, 126 : Corals, -J10 

 Brachiopoda, 371 : Chaetopoda, 488 

 Insecta,652: Arachnida, 673 : CVphulo 

 poda, 803 



Distribution, vertical, 8* 



Divaricators, 364 



Dochmius duodenal, 306 



Docoglossa, 733*, 756 



Doctrine of descent, 6 



Donax, 706 



Doris, 734, 742 



Doris (Arrhidoris) tubtrculata, 739 



Dorsal, 42* 



Dorsal cirri, of Antedon, 405 



Dorsal organ, of Apu*, 527 



Dorsal pores, of Earthworm, 455 



Dragon flies, 633, 644 



Drepanophorus, 289 



Drilophaga, 335 



Dromia, 601 



Ductus ejaculatorius, 302 



Dytiscm, 645 



E 



E 



IAR, 39* 



Ear-shells, 733 



Earthworm See 



Earthworms, 439 



Earwigs, 636 *" 



Ecdyses, of Apus, 539 



Echiniid,c, 414* 



Echinoderes, 319, 320 



Kchmadcrida, 319, 320 



Echinodermata, 375* : Examples, 375 

 393, 401, 405: Distinctive character 

 and classification, 410 : Systemati 

 position of examples, 414 : General or 

 ganisation, 415 : General form anc 

 symmetry, 415 : Systems of plates, 417 

 Modifications of form, 418 : Coelome 

 425 : Ambulacral system, 425 : Blood 

 vascular system, 426 : H;vmal system 



427 ; Axial organ, 428 : Enteric canal, 



428 : Nervous system, 429 : Sexes, 429 : 

 Development and metamorphosis, 430 : 

 Echinopfedium, 432: Ethology, &c., 

 434 : Self-mutilation and regeneration, 

 435: Affinities, 436 



Echinoidea, example, 393 : Distinctive 

 characters and classification, 412 : 

 Apical system, 417 : Modifications of 

 form, 421 : Dermal branchiae, 425 : 

 Stewart's organs, 425 : Ambulacral 

 system, 426 : Blood-vascular system, 



427 : Hamial system, 427 : Axial organ, 



428 : Enteric canal, 428 : Nervous 

 system, 429: Reproductive organs, 429: 

 Development, 430 : Ethology, 434 



Echinopadivm, 432* 

 tichiuorhynchu*, 312, 313, 314, 315 



